ASO Tools by AppFollow - Tools for App Store Optimization in App Store & Google Play
BetterAppIcons for iPhone - Create your unique app icon today.
App Launch Checklist - Planning tool for launching your app successfully
AppScreens - Screenshot creator for the Apple App and Google Play Store. Generate designer quality, pixel perfect screenshots for your iOS and Android apps at the same time
StorePreviewer - See how your app will look like on the App Store
SplitMetrics - SplitMetrics is the A/B testing platform for App Store and Google Play page to discover the most converting icons, screenshots, video, etc.